1N4745AW-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4745AW-TP is a 16 V, 1 W surface mount zener diode manufactured by Micro Commercial Co in SOD-123 package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. The 16 V nominal zener voltage with ±5% tolerance and 1 W maximum power dissipation define the functional requirements for substitution candidates.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	16	V
Tolerance	±5%	%
Power - Max	1	W
Impedance (Max)	16	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 12.2 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount
Package / Case	SOD-123
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 1N4745AW-TP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 16 V nominal
Package type: SOD-123 or SOD-123F (compatible surface mount packages)
Operating temperature range: Minimum -55°C to 150°C
RoHS3 compliance and MSL 1 rating

Secondary Compatibility Factors:

Power dissipation capacity: Minimum 1 W (or lower if application permits)
Voltage tolerance: ±5% or tighter
Impedance characteristics: Maximum 40 Ohms acceptable
Reverse leakage current: 100 nA or lower acceptable

Substitute parts are grouped into two categories: direct replacements with equivalent or superior power ratings, and functional alternatives with reduced power dissipation suitable for lower-power applications.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W/mW)	Zzt (Ohms)	Vr Leakage	Package	Status
1N4745AW-TP	Micro Commercial Co	16	±5%	1 W	16	5 µA @ 12.2 V	SOD-123	Obsolete
DFLZ16-TP	Micro Commercial Co	16	±6%	1 W	15	1 µA @ 12 V	SOD-123F	Active
BZT52B16-E3-08	Vishay General Semiconductor	16	±2%	410 mW	40	100 nA @ 12 V	SOD-123	Active
BZT52B16-E3-18	Vishay General Semiconductor	16	±2%	410 mW	40	100 nA @ 12 V	SOD-123	Active
BZT52B16-G3-08	Vishay General Semiconductor	16	±2%	410 mW	40	100 nA @ 12 V	SOD-123	Active
BZT52B16-G3-18	Vishay General Semiconductor	16	±2%	410 mW	40	100 nA @ 12 V	SOD-123	Active
BZT52C16-13-F	Diodes Incorporated	16	±6%	500 mW	40	100 nA @ 11.2 V	SOD-123	Active
BZT52C16-E3-08	Vishay General Semiconductor	16	±5%	410 mW	40	100 nA @ 12 V	SOD-123	Active
BZT52C16-E3-18	Vishay General Semiconductor	16	±5%	410 mW	40	100 nA @ 12 V	SOD-123	Active
BZT52C16-G3-08	Vishay General Semiconductor	16	±5%	410 mW	40	100 nA @ 12 V	SOD-123	Active
BZT52C16-G3-18	Vishay General Semiconductor	16	±5%	410 mW	40	100 nA @ 12 V	SOD-123	Active

Engineering Selection Recommendations

Direct Replacement (Preferred):

DFLZ16-TP from Micro Commercial Co is the primary direct replacement. This part maintains the same manufacturer lineage, delivers equivalent 1 W power dissipation, operates across the same temperature range (-55°C to 150°C), and carries ROHS3 compliance with MSL 1 rating. The SOD-123F package is mechanically compatible with SOD-123 footprints. The ±6% tolerance is marginally wider than the original ±5%, but remains within acceptable zener voltage specification bands for 16 V applications.

Active Alternatives (Lower Power):

The Vishay BZT52 series (BZT52B16 and BZT52C16 variants) and Diodes Incorporated BZT52C16-13-F provide active, readily available alternatives. These parts deliver 410 mW to 500 mW power dissipation, suitable for applications where the full 1 W capacity is not required. All alternatives maintain 16 V nominal zener voltage, SOD-123 package compatibility, ROHS3 compliance, and MSL 1 rating. The BZT52C16 series matches the original ±5% tolerance specification. Operating temperature ranges extend to -65°C minimum for Vishay parts, exceeding the original -55°C specification.

Compliance Status:

All substitute parts carry ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the original part's environmental certifications. All active alternatives are classified as current production components with established supply availability.

Frequently Asked Questions (FAQ)

Q: Can DFLZ16-TP directly replace 1N4745AW-TP in existing designs?

A: Yes. DFLZ16-TP is electrically and mechanically compatible. Both parts deliver 1 W power dissipation at 16 V nominal zener voltage, operate across -55°C to 150°C, and use surface mount SOD-123 family packages. The ±6% tolerance of DFLZ16-TP is acceptable for 16 V zener applications where ±5% was originally specified.

Q: What is the difference between BZT52B16 and BZT52C16 series?

A: Both series deliver 16 V nominal zener voltage in SOD-123 package. BZT52B16 variants specify ±2% tolerance, while BZT52C16 variants specify ±5% tolerance. Both series deliver 410 mW power dissipation, which is lower than the original 1N4745AW-TP 1 W rating. Selection depends on tolerance requirements and available power budget in the application circuit.

Q: Are SOD-123 and SOD-123F packages interchangeable?

A: Yes, for PCB footprint purposes. SOD-123F is a variant of SOD-123 with compatible lead spacing and mounting dimensions. Both packages are surface mount types suitable for automated assembly on standard PCB layouts designed for SOD-123 components.

Q: Why do some substitutes have lower power ratings than the original part?

A: The BZT52 series alternatives (410 mW to 500 mW) represent active production components with established supply chains. Applications requiring full 1 W dissipation capacity should use DFLZ16-TP. Applications with lower power requirements can utilize the BZT52 alternatives, which offer superior tolerance specifications (±2% to ±5%) and lower reverse leakage current (100 nA versus 5 µA).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL 1 (unlimited) moisture sensitivity rating, matching the environmental specifications of the original 1N4745AW-TP.

Q: What is the significance of the impedance (Zzt) parameter in substitution?

A: Impedance affects zener voltage stability under varying load conditions. The original part specifies 16 Ohms maximum impedance. Substitute parts with 40 Ohms impedance exhibit slightly higher voltage variation with current changes. For applications with strict voltage regulation requirements, DFLZ16-TP (15 Ohms) is preferred over BZT52 alternatives (40 Ohms).

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